Bristol Palin was quick to defend mom Sarah Palin’s weight loss after she came under fire recently for being too thin. Bristol explained what he mom does for a fitness routine and how she’s really quite an athlete.

According to a report from In Touch Weekly, Bristol says her mom has even been instrumental in her weight loss, as seen on Dancing With the Stars All Stars. It’s very clear that Bristol is carrying significantly fewer pounds and has a very taut and toned physique.

“She’s a big runner and likes to do everything,” Bristol says. “My mom is an awesome athlete and definitely my motivation. She keeps me going to hot yoga every morning and doing stuff like that.”

The two work out together routinely and Bristol admits there are times when she has trouble keeping up with her 48-year-old mother. She’s been asked a lot recently if she has concerns that her mom is too thin, and she answers those questions with a resounding ‘No!’